Question: Mention the source composition of sweetbread.
Paraphrase: What is sweetbread made of?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q49951 wdt:P1582 ?X . ?X wdt:P1672 ?answer}
Answer: sweetbread, rennet, veal, tête de veau, calf feet, knuckle, calf liver